440 Journal of Comparative Neurology and Psychology. 



ipheral gustatory terminals of the first order and their neurites 

 either descend to the inferior secondary gustatory nucleus in 

 the region of the funicular nuclei or ascend to the superior sec- 

 ondary gustatory nucleus in the isthmus. In both cases the 

 path is mainly and perhaps exclusively gustatory in function. 



/O/JUS I/// 



lobus iX 

 lob us X 



^^fior /ob^ 



Fig. ji?. Diagram ot the gustatory paths in the brain of the carp as seen 

 from the side. Only the long paths are shown in this diagram (cf. Fig. 39). 



n. VII. s., n.IX.s., ajid n.X.s., represent the sensory root fibers of the facial- 

 is, glossopharyngeus and vagus respectively, or gustatory neurones of the first 

 order (/). The secondary tracts, both ascending and descending, are marked 

 //. The tertiary path to the inferior lobe is marked ///; the path to the cere- 

 bellum and valvula, m. The return path from the inferior lobe to the motor nu- 

 clei of the oblongata (tractus lobo-bulbaris) is marked IJ^. The commissures of 

 the inferior and superior secondary nuclei are indicated by shaded areas (the lat- 

 ter marked c). ti.op., the optic nerve. The area marked 7i.fun. includes the 

 funicular nucleus and the inferior secondary gustatory nucleus. 



In cyprinoids the gustatory neurones of the smaller type proba. 

 bly share both this function and that of the intrinsic neurones. 

 In no case does a peripheral gustatory neurone connect direct- 

 ly with a peripheral motor neurone. There is always at least 

 one intermediate neurone between them. 



The vagal lobes of the larger cyprinoids differ from those 

 of the siluroids, in addition to the points already mentioned, in 

 the following respects: (i) The chief secondary neurones, be- 

 ing exceedingly numerous and crowded in a narrow peripheral 



